Incandescent gas-lamp.



No. 867,268. PATBNTED OCT. 1, 1907. T. s. HAIGHI. I-INGANDESGENT GAS LAMP.

APPLICATION FILED DEC. 16' 1905.

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THORNE STEWART HAIGHT, OF MANCHESTER, ENGLAND, ASSIGNOR TO CLARK WAY HARRISON, OF GLASGOW, MISSOURI.

IN CANDESGENT GAS-LAMP.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed December 15, 1905. Serial No. 291,885.

To all 'whom it may concern:

Be it known that THORNE STEWART HAIGHT, a citizen of the United States of America, residing at 21 New Gannon street, Manchester, in the county of Lancaster, England, gas-engineer, has invented certain A new and useful Improvements Relating to Incandescence Gas-Lamps, of which the following is a specification.

This invention relates to incandescence gas lamps of the kind that are used for outdoor or street lighting.

The said invention has for its chief object to provide improved means for protecting the incandescence mantles from the effects of stormy or windy weather during the time that the ordinary inclosing transparent casing is opened or the surrounding globe is shifted from its position around the mantles, so that the casing or globe can be cleaned or that one or more of the mantles can be conveniently renewed without the liability of the remaining mantles becoming broken or injured.

According to our invention the lamp is provided with a number of hollow or tubular draft screens or shields, one for each mantle, the said screens being capable of simultaneous movement to bring them to and from their inclosing or protective position relatively to the mantles and being also capable of independent manipulation, so that when said screens are lowered each screen will inclose a mantle but permit of any one or other of said mantles to be exposed as required by raising its screen without exposing the other mantles.

In order that the invention shall be clearly understood I will describe the same more fully with reference to the accompanying drawings which illustrate my invention applied to an incandescence gas lamp having a sliding globe.

Figures 1 and 2 are sectional elevations of the gas lamp, the former figure representing the globe in its normal or protecting position relatively to the mantles and the latter figure representing said globe in its lowered position and the screens protecting the mantles; one of the screens is however shown raised for exposing the mantle appertaining thereto. Fig. 3 is a vertical section on an enlarged scale of a sliding frame carrying the draft screens. Figs. 4 and 5 are crosssections taken approximately on the line 1.1. of Fig. 1, and the line 2.2. of Fig. 2. Fig. 6 is a plan of a perforated disk or frame by means of which the globe is supported in its raised position as hereinafter described.

Like letters of reference indicate similar parts in all the figures.

A is the lamp-body or casing provided with a shade A said casing being formed with apertures A near its upper end for the escape of the heated products of combustion when the lamp is burning. These apertures are surrounded by a hood A in the ordinary manner.

The sliding frame carries the hollow or tubular draft screens 0 O and the globe D.

E E are the mantles supported over the Bunsen burners e e in the usual way and e is the vertical gas supply pipe through which gas is supplied to the burners through the branch pipes 6 c is a downward extension on said gas pipe e having a shoulder e and terminating in a screw stem 6 for the reception of a nut 6.

When the globe D is in its raised position shown in Fig. 1, the screw stem e projects through the perforated disk or frame 6 to Which the lower end of the globe is connected, and by means of this and the nut a screwing onto said stem e, the globe, and with it the sliding frame and the screens 0, are held in their raised position. is a convex hinged cover piece with which the frame 6 is provided, said cover piece being held closed by a butterfly nut 0 The said sliding frame has in the example shown a central tube 1) surrounding the vertical gas supply pipe 0, which tube is made in two lengths joined together by a screw-boss b This boss carries an intermediate guide plate 1) formed with holes for the hollow or tubular draft screens 0, and the free ends of said tube b have end guide plates b 12 similar in form to the intermediate plate I).

The upper ends of the draft screens 0 have lateral projections c (Fig. 3) corresponding with recesses in the .upper end plate for limiting the extent to which the draft screens can descend in the frame. The lower end plate b has lugs b carrying set screws for securing the globe D thereto.

When it is desired to reach one or other of the mantles, the nut e is detached from the screw stem 6 and the globe together with the sliding frame is allowed to descend until the lower end of the tube b comes to rest upon the shoulder c of the central gas supply pipe 6. All the mantles are then inclosed by the hollow or tubular draft screens 0 'but any one or other of said mantles can be readily exposed by raising the particular draft screen appertaining thereto, as represented in Fig. 2. After said mantle has been inspected or renewed said screen is again lowered into its inclosing position and the globe together with the sliding frame again raised into the position shown in Fig. 1, in which position it is held by screwing the nut e in place on the screw stem e I have illustrated in the drawings a lamp provided with four incandescence mantles but obviously this number may be varied in accordance with requirements.

I-am aware that it has before been proposed to employ in an incandescence gas lamp, a draft shield for protecting the mantles while the globe is in its lowered position, but I believe it to be broadly new to provide a plurality of holloup or tubular drait screens capable of being manipulated independently of each other after all of them have been simultaneously lowered into their protecting position.

What I claim and desire to secure by Letters Patent of the United States is:

1. In an incandescence gas lamp, the combination with the burners and the mantles; of a surrounding transparent casing, a plurality of draft screens for the mantles, means for enabling simultaneous movement of said draft screens to and from their protecting position relatively to said mantles, and means-for enabling said screens to be independently manipulated while in their protecting position for the purpose specified.

2. In an incandescence gas lamp, the combination with the burners and the mantles of a snrrOunding transparent casing, a plurality of hollow or tubular draft screens for the mantles, a vertically movable frame carrying said draft screens, and means for enabling said screens to be independently raised and lowered in said frame while they are in their protecting position for the purpose specified.

3. In an incandescence gas lamp, the combination. with the burners and the mantles of a surrounding transparent casing, a plurality of hollow or tubular draft screens for the mantles, a vertically movable frame carrying said draft screens, means for limiting the movement of the frame, and means for enabling said screens to be inde pendently raised and lowered in said frame while they are in their protecting position for the purpose specified.

4. In an incandescenee gas lamp, the combination with the burners and the mantles of a surrounding transparent casing, a plurality of hollow or tubular draft screens for the mantles, a vertically sliding frame carrying said draft screens, means for limiting the movement of said frame, and guide plates forming part of said frame in which the draft screens are adapted to be independently raised and lowered while in their protecting position for the purpose specified.

5. In an incandescence gas lamp, the combination with the burners, and the mantles of :1 surrounding transparent casing, a plurality of hollow or tubular draft screens tor the mantles, a vertically sliding tube surrounding the central gas supply pipe, horizontal guide plates carried by said sliding tube and loosely supporting each of said draft screens, lneans for limiting the extent; to which the said tubular screen may descend in the guide plates, and means for limiting the extent of downward movement of said sliding tube substantially as and for the purpose specified.

6. in an incandescence gas lamp, the eombinai ion with the burners and the mantles; of a surrounding movable transparent casing or globe, a plurality oi.- hollow or tnbular draft screens for the mantles, a vertically sliding tube surrounding the central gas supply pipe, horizontal guide plates carried by said sliding tube and loosely supporting each of said draft screens, means for detachably connecting 

